Rename const_generics feature gate to adt_const_params

[JohnTitor]

Fixes #328

[JohnTitor]

Hmm, it seems Travis CI for this repo has been turned off: https://app.travis-ci.com/github/rust-lang/packed_simd
It's time to migrate to GHA :)

[krojew]

Any chance for merging this? 😉

[TheIronBorn]

If packed_simd is failing in an upstream crate or any other dependency you can't change, add this to your Cargo.toml

[patch.crates-io]
packed_simd = { git = "https://github.com/JohnTitor/packed_simd", branch = "rename-const-generics-feature-gate", package = "packed_simd_2" }

[calebzulawski]

This project is effectively retired, so I'm not sure what we want to do about CI. @workingjubilee?

[workingjubilee]

Once more for old time's sake, I suppose.

[workingjubilee]

Published this version as a point release: 0.3.6
Yes, Travis CI has broken for basically everything.
I will review a PR that changes it over.